Kerbal Space Program

Jet engines (similarly to RCS thrusters and ion engines) draw fuel in "staging priority". In practice that means that fuel tanks with most decouplers between them and the root of the ship get the highest priority and are emptied first.

Change root part of your ship to the payload and everything will work correctly.

The main problem is that the way how engines draw fuel is not always straightforward, poorly understood by players and not documented anywhere in the game.

Changing the root part to be on the payload made no difference to the fuel drain on the craft attached to my original post.

Okay, just changing root does not suffice (and maybe it should) but after I changed root to the command pod, then detached the rest of the plane by the first decoupler and attached it back, everything started working as intended.

My guess is that the scan for decouplers does not start at root part but starts at first part of the ship parts list.

Thank you for the assistance there.

Though I still feel that my initial assessment stands, that the way this performs at the moment gives no meaningful control over what fuel jets can use and in what order at least this workaround will suffice for most cases. Any system with payloads in separate cargo bays would presumably fall foul of this once again since one could not set both payloads to be the root part.

Don't get me wrong, I like the idea of jets consuming fuel evenly across multiple tanks (otherwise I would have opted to revert to their old behaviour myself), I just feel that more control is needed over how these are grouped and/or in what order they drain. Honestly I don't know why bypassing the no fuel cross-feed parts was necessary for this change, I presume that there was a reason though.

I agree with you that jet fuel drain rules are slightly more counterintuitive even than how rocket engines drain fuel - it is easy to run into problems and inexperienced users then get pressed to use mods that provide more freedom in fuel management. It is not documented anywhere and I spent considerable time figuring out how things work and validating my ideas about it. Some kind of simple solution to it would be nice, such as ability to "lock" payload: defining that whatever is behind selected decoupler or docking port is untouchable until decoupled or undocked.

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